Torque Ripple Suppression for PMSM Using Online Estimation and Compensation of the Stator Resistance

摘要

For the permanent magnet synchronous motor (PMSM)with unbalanced stator resistance, a method for online identification of three-phase stator resistance is proposed in this paper. According to the mathematical model under the asymmetrical state of the three-phase resistance of the motor, the method estimates the three-phase resistance quickly and accurately by forgetting factor recursive least (RLS)method. Asymmetry of the three-phase resistance causes an asymmetrical phase current, which causes the motor to generate torque ripple. Therefore, this paper also proposes a method to suppress torque ripple by compensating the asymmetric resistance in the stationary coordinate axis. The feasibility of the method is verified by simulation.